NAME
mkfs.gfs - Make a GFS filesystem
SYNOPSIS
mkfs.gfs [OPTION]... DEVICE
DESCRIPTION
mkfs.gfs is used to create a Global File System.
OPTIONS
-b BlockSize
Set the filesystem block size to BlockSize (must be a power of
two). The minimum block size is 512. The FS block size cannot
exceed the machine’s memory page size. On the most
architectures (i386, x86_64, s390, s390x), the memory page size
is 4096 bytes. On other architectures it may be bigger. The
default block size is 4096 bytes. In general, GFS filesystems
should not deviate from the default value.
-D Enable debugging output.
-h Print out a help message describing available options,
then exit.
-J MegaBytes
The size of the journals in Megabytes. The default journal size
is 128 megabytes. The minimum size is 32 megabytes.
-j Number
The number of journals for mkfs.gfs to create. You need at
least one journal per machine that will mount the filesystem.
-O This option prevents mkfs.gfs from asking for confirmation
before writing the filesystem.
-p LockProtoName
LockProtoName is the name of the locking protocol to use. The
locking protocol should be lock_dlm for a clustered file system
or if you are using GFS as a local filesystem (1 node only), you
can specify the lock_nolock protocol.
-q Be quiet. Don’t print anything.
-r MegaBytes
mkfs.gfs will try to make Resource Groups (RGs) about this big.
Minimum RG size is 32 MB. Maximum RG size is 2048 MB. A large
RG size may increase performance on very large file systems. If
not specified, mkfs.gfs will choose the RG size based on the
size of the file system: average size file systems will have 256
MB RGs, and bigger file systems will have bigger RGs for better
performance.
-s Blocks
Journal segment size in filesystem blocks. This value must be
at least two and not large enough to produce a segment size
greater than 4MB.
-t LockTableName
The lock table field appropriate to the lock module you’re
using. It is clustername:fsname. Clustername must match that
in cluster.conf; only members of this cluster are permitted to
use this file system. Fsname is a unique file system name used
to distinguish this GFS file system from others created (1 to 16
characters). Lock_nolock doesn’t use this field.
-V Print program version information, then exit.
EXAMPLE
mkfs.gfs -t mycluster:mygfs -p lock_dlm -j 2 /dev/vg0/mygfs
This will make a Global File System on the block device
"/dev/vg0/mygfs". It will belong to "mycluster" and register
itself as wanting locking for "mygfs". It will use DLM for
locking and make two journals.
mkfs.gfs(8)